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t=40min=3/4h=2 400s
v=s/t
- prędkość wyrażona w m/s:
30 000m / 2 400s = 300m / 24s = 25m / 2s = 12,5 m/s
- prędkość wyrażona w km/h:
30km / 3/4h = 120km / 3h = 40 km/h